Random access method and random access system for terminal in high-speed mobile environment

摘要

A random access method and random access system for a terminal in a high-speed mobile environment are provided. Wherein, the method comprises: selecting a random access preamble format according to a preset cell coverage radius target value; judging whether using a restricted set of cyclic shift quantities pre-configured satisfies a requirement of the cell coverage radius target value under the selected random access preamble format; if not satisfying, selecting a cyclic shift quantity which satisfies the requirement of the cell coverage radius target value from a unrestricted set of the cyclic shift quantities pre-configured; and generating a random access signal according to the cyclic shift quantity and a pre-configured mother code, and performing access using the random access signal. Through the above-mentioned technical scheme, the embodiment of the present document provides a more perfect random access method and random access system for a terminal in a high-speed mobile environment.

主权项

1. A random access method for a terminal in a high-speed mobile environment, comprising:
selecting a random access preamble format according to a preset cell coverage radius target value; judging whether using a restricted set of cyclic shift quantities pre-configured satisfies a requirement of the cell coverage radius target value under the selected random access preamble format; if the restricted set does not satisfy the requirement of the cell coverage radius target value, then selecting a cyclic shift quantity which satisfies the requirement of the cell coverage radius target value from an unrestricted set of cyclic shift quantities pre-configured; and generating a random access signal according to the selected cyclic shift quantity and a pre-configured mother code, and performing access using the random access sign; wherein, the step of selecting the random access preamble format according to the preset cell coverage radius target value comprises: calculating a maximum cell coverage radius supported by a corresponding format according to a length of a guard interval in a random access subframe under every random access preamble format; and selecting a random access preamble format of which the supported maximum cell coverage radius is greater than or equal to the cell coverage radius target value.